18738901 has 4 divisors (see below), whose sum is σ = 19385100. Its totient is φ = 18092704.

The previous prime is 18738899. The next prime is 18738917. The reversal of 18738901 is 10983781.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4100625 + 14638276 = 2025^2 + 3826^2 .

It is a cyclic number.

It is not a de Polignac number, because 18738901 - 2¹ = 18738899 is a prime.

It is a super-2 number, since 2×18738901² = 702292821375602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18738961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323056 + ... + 323113.

It is an arithmetic number, because the mean of its divisors is an integer number (4846275).

Almost surely, 2^18738901 is an apocalyptic number.

It is an amenable number.

18738901 is a deficient number, since it is larger than the sum of its proper divisors (646199).

18738901 is an equidigital number, since it uses as much as digits as its factorization.

18738901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646198.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 18738901 is about 4328.8452270785. The cubic root of 18738901 is about 265.6122121825.

The spelling of 18738901 in words is "eighteen million, seven hundred thirty-eight thousand, nine hundred one".